You can describe a person as being deep. Which means they speak emotionally and thoughtfully . Or, You can describe a gang, party, group, church, park, etc. a place basically as being "deep" which means packed or crowed/a lot of people are there. You can also say deep about how many people are with you . If there isn't alot of people you can put a number in front of it . Such as 2-deep ( 2 people), 3-deep (3 people), 8-deep ( 8 people) ,etc . Ex: we 4-deep.. Or it's deep in this car!

You can use any number but it has to be how many people are with you or at the place your at. If there is too many people to count just say deep..